Thermodynamics

81. On volume basis, air contains following parts of oxygen

1. 21
2. 23
3. 25
4. 77
5. 79

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82. On weight basis, air contains following parts of oxygen

1. 21
2. 23
3. 25
4. 73
5. 79

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83. One barometric pressure or 1 atmospheric pressure is equal to

1. 1 kgf/cnr2
2. 1.033 kgf/cm2
3. 0 kgf/cm2
4. 1.0197 kgf/cm2
5. 100 kgf/cm2.

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84. One watt is equal to

1. 1 Nm/s
2. 1 N/mt
3. 1 Nm/hr
4. 1 kNm/hr
5. 1 kNm/mt.

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85. Otto cycle consists of following four processes

1. two isothermals and two isentropics
2. two isentropics and two constant volumes
3. two isentropics, one constant volume and one constant pressure
4. two isentropics and two constant pres-sures
5. none of the above.

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86. Properties of substances like pressure, temperature and density, in thermodynamic coordinates are

1. path functions
2. point functions
3. cyclic functions
4. real functions
5. thermodynamic functions.

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87. Reversed joule cycle is called

1. Carnot cycle
2. Rankine cycle
3. Brayton cycle
4. Bell Coleman cycle
5. Dual cycle.

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88. Solids and liquids have

1. one value of specific heat (ft) two values of specific heat
2. three values of specific heat
3. no value of specific heat
4. one value under some conditions and two values under other conditions.
5. None of above

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89. Specific heat of air at constant pressure is equal to

1. 0.17
2. 0.21
3. 0.24
4. 1
5. 1.41

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90. Stirling and Ericsson cycles are

1. reversible cycles
2. irreversible cycles
3. quasi-static cycles
4. semi-reversible cycles
5. adiabatic irreversible cycles.

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